netdev - Re: [PATCH v6 11/11] of: mdio: Prevent of_mdiobus

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Date:   Fri, 6 Oct 2017 00:21:59 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Rob Herring <robh@...nel.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Corentin Labbe <clabbe.montjoie@...il.com>,
        mark.rutland@....com, maxime.ripard@...e-electrons.com,
        wens@...e.org, linux@...linux.org.uk, catalin.marinas@....com,
        will.deacon@....com, peppe.cavallaro@...com,
        alexandre.torgue@...com, frowand.list@...il.com,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v6 11/11] of: mdio: Prevent of_mdiobus_register from
 scanning mdio-mux nodes

> Looking at this some more, why can't mdio-mux-mmio be used?

Hi Rob

That was my first thought. And then i dug into the details. The mux is
more than just a couple of bits in an address space. Clocks needs to
be enabled/disabled, and the MAC needs a reset, when the mux changes.
So the mux needs intimate knowledge of MAC.

   Andrew